A monitoring CNC system based on networks was designed. Based on the comprehensive planning of function module of the CNC system, a four-layer open architecture reference model was proposed,which met demands of the structural adjustment and follow-up extension. To satisfy the multifucntion integration of CNC system ,machine tool state monitoring,taking the real-time processing quality and avoiding the twice fixturing, the prototype of CNC system based on embedded monitor unit was studied and constructed. Analyzing the situation of machine tool state monitoring,furthermore,the embedded monitor unit model was set up by the structure of DSP (digital signal processing）and ARM（advanced RISC machines）.The unit,by which the state of machine tools can be accessed,connected with CNC system through a bus and can be reconfigured for the target changing or to meet different demands;Using the open architecture, quality testing unit was embedded to get the geometry information of the part on machine.It provides a feasible program of tool maintenance and multifunction integration.

computerized numerical control(CNC) system, state monitoring, quality testing, layering, bus

构建了一个基于网络的可监控数控系统。为适应开放式数控系统的发展趋势，构建了一个四层次的开放式系统架构模型，该模型可满足功能结构调整与后续功能扩展的需求;为实现数控系统的功能集成、机床运行状态的监测与加工质量的实时获取以及免二次装卡的需求，建立了基于嵌入式监测单元与在机质量检测单元的数控系统原型。在分析机床监测发展现状的基础上，组建了基于DSP+ARM架构的嵌入式监测单元，该单元可进行机床运行状态的实时监测，并通过现场总线方式与数控系统实现无缝连接，还可依据监测目标的改变与需求进行柔性化的软硬件配置;利用开放式架构，嵌入质量检测单元，可实现被加工工件几何信息的在机获取。研究结果为数控装备维护与系统功能集成提供了一种可行的方案。 

数控系统, 状态监测, 质量检测, 层次化, 总线